6: Serialization in C#

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6: Serialization
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Figure 6-4: Multiple links between states
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For this domain model, the domain property Action on the IssueStateTransition relationship is set to be both a name and a key The latter is done in the DSL explorer through the Xml Serialization Behavior, as shown in Figure 6-5 The XML document for the model shown in Figure 6-4 is the same as for the previous example shown in Figure 6-2, except that instead of transitions coming from the Submitted state to the different successor states Pending and Closed, there are two outgoing transitions to the Pending state
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<issueState name="Submitted" icon="submittedico" description="The issue has been submitted for assessment"> <successors> <issueStateTransition action="pend"> <issueStateMoniker name="StateModel/Pending" /> </issueStateTransition> <issueStateTransition action="monitor"> <issueStateMoniker name="StateModel/Pending" /> </issueStateTransition> </successors> </issueState>
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However, for this version it is possible to save references to the individual IssueStateTransition links Since the Action property is a key for the link, the fully quali ed name will end with the key for the link, which comes after
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Diagram XML File Format
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the key for the source of the link, which itself comes after the key and quali er for the model Here is a moniker element using this scheme:
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<issueStateTransitionMoniker action="/CJKWStates/StateModel/Submitted/pend"/>
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Such references would occur in the diagram le, so let s move on to that topic
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Figure 6-5: Setting the Action domain property to be a key
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Diagram XML File Format
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The diagram serialization uses the same techniques as the model serialization, and although it is built into the DSL Tools, it is in fact generated from a domain model in just the same way, with some minor customizations For this reason, the format of the diagram le is straightforward and easy to
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6: Serialization
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understand Unlike the model le, though, there are few options for the DSL author to customize the diagram le To help keep the discussion compact, we create a very small model, using the same domain model that we used for Figure 6-1, but with just two states Figure 6-6 shows the diagram corresponding to this small model, as displayed on the screen
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Figure 6-6: Simple Issue State diagram
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Let s look at the contents of the diagram le that corresponds to the diagram shown in Figure 6-6
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< xml version="10" encoding="utf-8" > <issueStateDiagram dslVersion="1000" absoluteBounds="0, 0, 11, 85" name="ch6_1"> <issueStateModelMoniker issueTypeName="/CJKWStates/StateModel" /> <nestedChildShapes> <issueStateShape Id="8ced5d17-9c54-496c-8814-c979246c156b" absoluteBounds="1375, 175, 1, 05"> <issueStateMoniker name="/CJKWStates/StateModel/Raised" /> </issueStateShape> <issueStateShape Id="64972ea6-400b-4188-ad55-bb5d22473d26" absoluteBounds="1375, 3375, 1, 05"> <issueStateMoniker name="/CJKWStates/StateModel/Closed" /> </issueStateShape> <startElementShape Id="b333c44b-5520-4478-81ca-5ba4fe73b651" absoluteBounds="175, 125, 01666666716337204, 01666666716337204"> <startElementMoniker name="/CJKWStates/StateModel/Start" /> </startElementShape> <startConnector
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Diagram XML File Format
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edgePoints="[(183333333581686 : 141666667163372); (183333333581686 : 175)]" manuallyRouted="false" fixedFrom="NotFixed" fixedTo="NotFixed" TargetRelationshipDomainClassId="d82fc1a1-c67b-45ea-8aa1a43c86f0a425"> <nodes> <startElementShapeMoniker Id="b333c44b-5520-4478-81ca-5ba4fe73b651" <issueStateShapeMoniker Id="8ced5d17-9c54-496c-8814-c979246c156b" </nodes> </startConnector> <transitionConnector edgePoints="[(1875 : 225); (1875 : 262125); (275 : 262125); (275 : 300375); (185416666666667 : 300375); (185416666666667 : 3375)]" manuallyRouted="true" fixedFrom="NotFixed" fixedTo="NotFixed" TargetRelationshipDomainClassId="57f67bbc-668c-445a-af575fe3810f11da"> <nodes> <issueStateShapeMoniker Id="8ced5d17-9c54-496c-8814-c979246c156b" <issueStateShapeMoniker Id="64972ea6-400b-4188-ad55-bb5d22473d26" </nodes> </transitionConnector> </nestedChildShapes> </issueStateDiagram>
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/> />
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The root element of the diagram le has the element <issueStateDiagram> This can be customized using the DSL designer It has three attributes The dslVersion attribute gives the version of the diagram serializer The absoluteBounds attribute exists for any shape including the diagram and speci es its position in world coordinates It has the structure (x, y, width, height), where x and y are the coordinates of the upper left-hand corner of the rectangle bounding the shape All coordinates and sizes are measured in inches The name attribute contains the name of the diagram, which is initialized when the diagram is created For each DSL, the diagram refers to the root element of the model, which in this case is an instance of IssueStateModel The next element in the diagram le is the cross-reference to that MEL, which uses its fully quali ed name The IssueStateModel MEL itself is serialized in the model le, of course, not the diagram le Following that is the <nestedChildShapes> element This represents an embedding relationship every shape that appears on the diagram is embed-
6: Serialization
ded in the diagram using this relationship Nested in this element are all of the shapes and connectors on the diagram Each shape is serialized with its attributes in the case of the IssueStateShape, these are its absoluteBounds and its Id and a cross-reference to the MEL that it represents Each connector is also serialized with its attributes The edgePoints attribute gives the coordinates of the ends and kinks The manuallyRouted attribute determines whether the connector has been routed by hand since creation The fixedFrom and fixedTo attributes with the value of NotFixed determine that the place that the connector meets the shape can move Each connector is serialized within the child element <nodes> with references to the shapes at its ends Together with the identity of the domain class of the relationship itself, this allows the associated link to be identi ed as long as duplicates are not allowed for the relationship As noted earlier, this avoids the need for unique keys to be saved for every link and thus keeps the model le compact and easy to understand